Thousands of people receiving Social Security benefits have had their money diverted into criminal accounts. Here’s what to know.

For the past two decades, Liz Birenbaum’s 88-year-old mother, Marge, has received her Social Security check on the second Wednesday of each month. It’s her sole source of income, which pays for her room at a long-term care center, where she landed last October after having a stroke.

When the deposit didn’t arrive in January, they logged into Marge’s Social Security account, where they found some startling clues: the last four digits of a bank account number that didn’t match her own, at a bank they didn’t recognize.

“Someone had gotten in,” said Ms. Birenbaum, of Chappaqua, N.Y. “Then I hit a panic button.”

It quickly became evident that a fraudster had redirected the $2,452 benefit to an unknown Citibank account. Marge, who lives in Minnesota, had never banked there. (Ms. Birenbaum requested to refer to her mother by her first name only to protect her from future fraud.)

Ms. Birenbaum immediately started making calls to set things right. When she finally connected with a Social Security representative from a local office in a Bloomington, Minn., the rep casually mentioned that this happens “all the time.”

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